Optical monitoring of the z=4.40 quasar Q 2203+292

Abstract

We report Cousins R-band monitoring of the high-redshift (z=4.40) radio quiet quasar Q 2203+292 from May 1999 to October 2007. The quasar shows maximum peak-to-peak light curve amplitude of ~0.3 mag during the time of our monitoring, and ~0.9 mag when combined with older literature data. The rms of a fit to the light curve with a constant is 0.08 mag and 0.2 mag, respectively. The detected changes are at ~3-sigma level. The quasar was in a stable state during the recent years and it might have undergone a brightening event in the past. The structure function analysis concluded that the object shows variability properties similar to those of the lower redshift quasars. We set a lower limit to the Q 2203+292 broad line region mass of 0.3-0.4 M_odot. Narrow-band imaging search for redshifted Ly_alpha from other emission line objects at the same redshift shows no emission line objects in the quasar vicinity.

arXiv comment9 pages, 8 figures, accepted for publication in MNRAS

References in corpus (23)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• The SDSS View of the Palomar-Green Bright Quasar Survey
• Homogeneous Photometry for Star Clusters and Resolved Galaxies. II. Photometric Standard Stars
• The Ensemble Photometric Variability of ~25000 Quasars in the Sloan Digital Sky Survey
• Reverberation Mapping of High-Luminosity Quasars: First Results
• The Sloan Digital Sky Survey Quasar Catalog III. Third Data Release
• Long-term optical variability properties of the Palomar-Green quasars
• Broad Emission Line Regions in AGN: the Link with the Accretion Power
• Structure Function Analysis of Long Term Quasar Variability
• Variability in active galactic nuclei: confrontation of models with observations
• Statistical analyses of long-term variability of AGN at high radio frequencies
• Chandra Observations of the Highest Redshift Quasars from the Sloan Digital Sky Survey
• The Intrinsically X-ray Weak Quasar PHL 1811. II. Optical and UV Spectra and Analysis
• The Variability of Quasars. II. Frequency Dependence
• The dependence of quasar variability on black hole mass
• The Mass of Quasar Broad Emission Line Regions
• Long Term Variability of SDSS Quasars
• Timescale of variation and the size of the accretion disc in active galactic nuclei
• Implications of Quasar Black Hole Masses at High Redshifts
• Emission-Line Properties of z > 4 Quasars
• Long-term optical photometric monitoring of the quasar SDSS J153259.96-003944.1

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